I was wondering around Wal-Mart today looking at clearance items. They had a Minnkota digital battery gauge for $9.00. It was designed to touch one probe to the hot and one to the ground to test a battery. I opened it up and soldered a red and a black wire into the right places, hooked it up to that worthless outlet under the seat and velcroed it to the tank bib. I now have a digital voltmeter with LED lights for $9.00. I had been wanting one so I could tell if I was overloading the system when I was using my electric vest and gloves with the passing lights but I didn't want to spend as much as a system like the Kuryakin costs. The Minnkota was built to monitor a trolling motor.